What is the battery model for BMW 120i?
3 Answers
BMW 120i uses a CR2450 lithium manganese dioxide button battery. Battery purpose: Automotive batteries are mainly used for starting and lighting in vehicles such as cars, motorcycles, tractors, and diesel engines. The car battery acts as a voltage stabilizer for the vehicle's electrical system, mitigating impact voltages in the electrical system and protecting electronic equipment in the car. Battery working principle: When the car engine stops running or is at low idle speed, the battery supplies power to the car's electrical equipment. When the power demand exceeds the generator's supply capacity, the battery also participates in power supply. During normal generator operation, the car battery stores excess electricity generated by the alternator.
I used to drive a BMW 120i, which typically uses an H8 AGM battery with quite standard dimensions. One winter, my car suddenly wouldn't start, and upon inspection, I found the battery had aged. The label clearly stated AGM H8, with about 80 ampere-hours voltage. When replacing it, you must match the original specifications because BMWs have start-stop systems, and using a regular battery can easily damage the vehicle control functions. I make it a habit to check the voltage with a multimeter every six months and keep the terminals clean and rust-free. If you're unsure, check the user manual or look for the model sticker under the hood—don't attempt a DIY replacement blindly. AGM batteries last about 4 years, and regular maintenance can save you a lot of trouble.
Having worked in the auto repair industry for a long time, I'm very familiar with the BMW 120i's battery. It's typically an AGM type, such as the H8 model, with a cold cranking current of around 760A. Before replacement, confirm the battery size and terminal positions, as incorrect selection may trigger electronic fault warnings. AGM batteries are highly efficient and durable, supporting frequent start-stop operations, though they are slightly more expensive. It's recommended to visit a professional shop to test the original factory data, keep the battery tray clean to extend its lifespan, and regularly check the charge-discharge status to prevent sudden issues.
